Radio Shack 20-006A User Manual
Radio Shack 20-006A User Manual

Radio Shack 20-006A User Manual

Telescoping antenna for portable scanners and walkie talkies

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20-006.fm Page 1 Tuesday, August 3, 1999 2:25 PM
Telescoping Antenna for Portable Scanners
and Walkie Talkies
You can use this telescoping antenna for either receiving or transmitting. You can
use it as a receiving antenna from 25 MHz through the 1296 MHz Ham Band, and
you can use it as a
MHz.

USING THE ANTENNA FOR TRANSMITTING

For transmitting, you must set the antenna length as close as possible to the trans-
mitting frequency's
using the proper standing wave ratio (SWR).
Cautions:
• When you use the antenna to transmit, you must always collapse the section
located just above the loading coil. If you do not, you might damage the
antenna and/or your radio.
• When you use the antenna to transmit, you must calculate the
and adjust the antenna length accordingly. If you do not do this, you can dam-
age your transmitting equipment due to an improper standing wave ratio
(SWR).
Use this formula to calculate the proper length for a
tenna:
Freq. in MHz
Example:
2834
147 (MHz) =19.3 Inches
RadioShack is a trademark used by Tandy Corporation.
wavelength transmitting antenna from 130 MHz through 535
1
/
4
/
wavelength. This ensures the best possible transmission by
1
4
2834
Antenna Length in Inches
=
© 1996 Tandy Corporation.
All Rights Reserved.
Cat. No. 20-006A
/
wavelength
1
4
1
/
wavelength transmitting an-
4

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Summary of Contents for Radio Shack 20-006A

  • Page 1 Use this formula to calculate the proper length for a tenna: 2834 Freq. in MHz Example: 2834 147 (MHz) =19.3 Inches RadioShack is a trademark used by Tandy Corporation. wavelength transmitting an- Antenna Length in Inches © 1996 Tandy Corporation. All Rights Reserved. Cat. No. 20-006A wavelength...
  • Page 2 20-006.fm Page 2 Tuesday, August 3, 1999 2:25 PM USING THE ANTENNA FOR RECEIVING For the best reception, adjust the antenna length as shown below. Frequency 25–50 MHz (VHF Low) 50–54 MHz (Ham) 108–136 MHz (Aircraft) 138–144 MHz (Government) 144–148 MHz (Ham) 148–174 MHz (VHF High) 220 MHz (Ham) 380–450 MHz (UHF Low)
  • Page 3 20-006.fm Page 3 Tuesday, August 3, 1999 2:25 PM...
  • Page 4 20-006.fm Page 4 Tuesday, August 3, 1999 2:25 PM...

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